linux-kernel - Re: Long timeout when booting >= 2.6.38

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Message-ID: <4DC100D0.1030302@christianhoffmann.info>
Date:	Wed, 04 May 2011 09:31:28 +0200
From:	Christian Hoffmann <email@...istianhoffmann.info>
To:	john stultz <johnstul@...ibm.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Long timeout when booting >= 2.6.38

On 05/04/2011 03:00 AM, john stultz wrote:
> On Tue, 2011-05-03 at 00:27 +0200, Christian Hoffmann wrote:
>>>
>>> Can you reproduce the hang booting with "clocksource=hpet" and
>>> "clocksource=acpi_pm" ?
>>
>> Both hang also.
>
> Sorry, one more clarifying point here:
>
> When you used either clocksource=hpet/clocksource=acpi_pm did the
> behavior of the system seem different after booting? In other words:
> does running time waiting a few seconds and then running time again show
> the expected passage of time?  Were any following hangs seen, or was it
> only the first one at boot?

Hi,

with hpet no problems seen. No further hangs either.

In fact, switching to acpi_pm doesn't seem to work:

$ dmesg | grep clock

[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-2.6.39-rc5-ch-broken+ 
root=/dev/mapper/vg-root ro quiet splash vt.handoff=7 clocksource=acpi_pm
[    0.000000] Kernel command line: 
BOOT_IMAGE=/vmlinuz-2.6.39-rc5-ch-broken+ root=/dev/mapper/vg-root ro 
quiet splash vt.handoff=7 clocksource=acpi_pm
[    0.000000] hpet clockevent registered
[    1.413835] Switching to clocksource hpet
[    1.420762] Override clocksource acpi_pm is not HRT compatible. 
Cannot switch while in HRT/NOHZ mode
[  147.940143] Refined TSC clocksource calibration: 2809.409 MHz.
[  147.940147] Switching to clocksource tsc

Regards,
Chris
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